US20130236266A1 - Self-locking screw - Google Patents
Self-locking screw Download PDFInfo
- Publication number
- US20130236266A1 US20130236266A1 US13/885,968 US201113885968A US2013236266A1 US 20130236266 A1 US20130236266 A1 US 20130236266A1 US 201113885968 A US201113885968 A US 201113885968A US 2013236266 A1 US2013236266 A1 US 2013236266A1
- Authority
- US
- United States
- Prior art keywords
- thread
- protuberances
- self
- screw
- locking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000000694 effects Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
Definitions
- the present invention relates to a self-locking thread which can be used both as an outer thread, for example in screws or bolts, and as an inner thread, for example in nuts.
- Self-locking screw connections are in great demand.
- Securing elements according to the prior art often have chemical additives which pollute the environment and only allow a single securing action.
- a rescrewing operation with a new securing action is not possible and can be carried out only by using a new screw or nut.
- an object of the present invention is to provide a self-locking thread which neither requires chemical additives, nor can it bring about a plastic deformation of the counter-thread or damage to the head support.
- the connection is intended to be releasable at any time and to be able to be screwed again at any time with a complete securing action.
- this object is achieved with a self-locking thread in which the flanks which are loaded when the thread is screwed are provided with a protuberance.
- the protuberance prefferably extends in each case over only a portion or a plurality of short portions of each thread turn. An excessively powerful clamping effect is thereby prevented, by means of which a rescrewing of the connection would have otherwise been made impossible.
- the protuberances In order to simplify the production, it is preferable for the protuberances to be constructed having a circular-arc-shaped cross-section.
- the height of the protuberances is selected such that the protuberances do not yet come into non-positive-locking engagement with the flanks of the opposing thread when the thread is screwed in, but rather only when the thread is tightened. Beforehand, the thread can rotate freely, since the counter-thread provides sufficient play when the height of the protuberances is selected correctly.
- a clamping action can also be produced before the screw or nut reaches a stop, for example in order to provide a movable but non-releasable connection.
- the protuberances are preferably constructed so as to taper in the screwing-in direction of the thread with a rounded tip.
- FIG. 1 shows a screw having an outer thread according to the invention
- FIG. 2 shows a nut having an inner thread according to the invention
- FIG. 3 shows a screw connection having an outer thread according to the invention in an inner thread of a workpiece
- FIG. 4 shows a screw connection of a nut having an inner thread according to the invention with a commercially available screw.
- FIG. 1 is a three-dimensional illustration of a screw 10 having a head 12 and a shaft 14 having an outer thread 16 according to the invention.
- the flanks of the thread which receive the forces when the screw is tightened that is to say, in the present case the flanks 18 of the outer thread 16 directed upwards in FIG. 1 are provided with protuberances 20 which extend over a limited curved portion of the respective thread turns into the thread turn.
- these protuberances 20 are each spaced apart by approximately 120°, that is to say, there are three protuberances 20 on a winding revolution.
- the protuberances cover a total of approximately 1 ⁇ 3 of the entire winding revolution. They are constructed so as to acutely taper in a rotation direction with a rounded end and so as to arch in a circular-arc shape in cross-section.
- FIG. 2 shows a nut 100 according to the invention with an inner thread 116 .
- the flanks 118 which are loaded with force when the nut is tightened also carry protuberances 120 which in this case also each extend over only a short portion of an entire thread revolution.
- protuberances 120 which in this case also each extend over only a short portion of an entire thread revolution.
- only two mutually opposed protuberances are provided in a thread revolution, and in this instance cover less than 1 ⁇ 8 of the entire thread revolution.
- FIG. 3 shows the state in which a screw 10 having an outer thread 16 according to the invention is screwed into a workpiece 30 and tightened, there being located between the head (not illustrated) of the screw 10 and the workpiece 30 another workpiece 40 which is secured by means of the screw 10 .
- the protuberances 20 are arranged on the flanks 18 of the outer thread 16 that receive the load.
- the precise configuration of the protuberances 20 can be seen particularly well. They have a circular-arc-shaped cross-section and taper at least in the screwing-in direction of the screw 10 and terminate with a rounded tip 22 .
- FIG. 3 which shows the state after the screw 10 has been tightened in the workpiece 30 , it can be seen very well how a deformation of the force-absorbing flanks of the counter thread 32 in the workpiece 30 occurs owing to the tightening force.
- a corresponding deformation is thereby caused in the workpiece 30 which deformation, according to the invention, is only a resilient and not a plastic deformation of the regions of the downwardly directed flanks of the counter thread 32 opposite the protuberances 20 in FIG. 3 .
- the corresponding resilient deformation is indicated by the tension lines 34 in the workpiece 30 .
- the clearance 36 which enables the easy screwing-in of the screw thread 16 into the inner thread 32 of the workpiece 30 has now been moved completely downwards by the tightening of the screw 10 .
- FIG. 4 shows the screw connection of a nut 100 according to the invention with a commercially available screw 10 ′.
- the workpiece clamped between the head 12 of the screw 10 ′ and the nut 100 is not illustrated in order to simplify the drawings. However, the tightened state of the screw connection is shown.
- both the screw 10 ′ and the nut 100 are each illustrated in a cross-section. It can clearly be seen how the protuberances 120 on the thread turns of the nut thread 116 bring about a resilient deformation of the flanks of the screw thread 16 ′ which are in this instance force-loaded. The corresponding resilient deformation is indicated by the tension lines 134 .
- the securing of the self-locking thread according to the invention is therefore carried out when the corresponding screw connection is tightened and the corresponding pretensioning force is consequently applied by means of partial resilient deformation of the flanks of the counter-thread. Owing to this resilient deformation, a spring effect is produced at the force-loaded thread flank of the counter-thread. Consequently, the screw connection according to the invention is secured against being released by means of distortion.
- the protuberances 20 according to the invention settle resiliently in the counter-thread.
- an additional release torque must necessarily be overcome, which is produced by means of the resilient settlement of the protuberances 20 in the counter-thread.
- This “resilient toothing effect” ensures that, when the connection is released, there is no damage to the counter-thread. Consequently, the connection can be rescrewed at any time and also released and screwed again several times, without new components having to be used.
- the self-securing thread described here secures a screw connection in such a manner that no chemical additives are required, and no permanent plastic deformation of the threads or damage to the head support occur.
- the connection can be released at any time and can be rescrewed at any time with a complete securing effect.
- the principle of securing according to the invention is therefore based on the resilient deformability of the flanks of the counter-thread.
- the self-locking thread according to the invention has, according to the invention, partially or depending on the application, specially constructed protuberances 20 over the complete length of the thread.
- protuberances may be applied, depending on the load to be anticipated, by the pretensioning forces when the screw connection is tightened, either on the upper side or on the lower side of the respective thread. If a thread is desired which secures in a self-locking manner, at a specific screwing-in depth regardless of the pretensioning force, protuberances may be applied on both thread flanks in the corresponding region of the thread. These then act counter to each other and require no pretensioning force during tightening in order to clamp. In this manner, loose screw connections, for example of components which are intended to remain movable, can also be secured against being rotated open. This solution according to the invention therefore makes the locking of two nuts superfluous.
- the protuberances 20 are constructed in such a manner that they do not cause any permanent mechanical deformation in the counter-thread when the thread is screwed in. If the thread is intended to be secured only after the screw connection is tightened by the pretensioning force, the height of the protuberances 20 is intended to be constructed in such a manner that screwing in as far as the head support is possible without additional torque.
- protuberances 20 , 120 The production of the threads which are provided according to the invention with protuberances 20 , 120 is unproblematic nowadays, since threads are currently generally milled or rolled. Accordingly, corresponding recesses for the protuberances 20 must be provided only once in the milling or rolling tools. Consequently, these protuberances can also be produced when the threads are milled or rolled without any additional processing complexity.
Abstract
Description
- The present invention relates to a self-locking thread which can be used both as an outer thread, for example in screws or bolts, and as an inner thread, for example in nuts.
- Self-locking screw connections are in great demand. Securing elements according to the prior art often have chemical additives which pollute the environment and only allow a single securing action. A rescrewing operation with a new securing action is not possible and can be carried out only by using a new screw or nut.
- Other securing elements from the prior art produce their securing action by increasing the head friction, for example by means of ribs on the workpiece-side lower face of the screw head. However, the counter-position is often mechanically damaged to a great extent. The securing action is further decreased by settlement of the head support, for example as a result under vibrations or owing to temperature fluctuations. Based on this prior art, an object of the present invention is to provide a self-locking thread which neither requires chemical additives, nor can it bring about a plastic deformation of the counter-thread or damage to the head support. According to the invention, the connection is intended to be releasable at any time and to be able to be screwed again at any time with a complete securing action.
- According to the invention, this object is achieved with a self-locking thread in which the flanks which are loaded when the thread is screwed are provided with a protuberance.
- It is preferable for the protuberance to extend in each case over only a portion or a plurality of short portions of each thread turn. An excessively powerful clamping effect is thereby prevented, by means of which a rescrewing of the connection would have otherwise been made impossible.
- In order to simplify the production, it is preferable for the protuberances to be constructed having a circular-arc-shaped cross-section.
- If it is desirable for the self-locking action of the thread to only occur when the screw connection is tightened, it is preferable for the height of the protuberances to be selected such that the protuberances do not yet come into non-positive-locking engagement with the flanks of the opposing thread when the thread is screwed in, but rather only when the thread is tightened. Beforehand, the thread can rotate freely, since the counter-thread provides sufficient play when the height of the protuberances is selected correctly.
- According to the invention, however, a clamping action can also be produced before the screw or nut reaches a stop, for example in order to provide a movable but non-releasable connection. In such a case, it is preferable, at a specific location of the thread, to provide each of the two flanks of the thread with a protuberance. The clamping action is then sure to occur, even when no pretensioning is built up by the tightening of the thread. In this manner, a counter-nut can be dispensed with.
- In order to prevent premature clamping of the thread, the protuberances are preferably constructed so as to taper in the screwing-in direction of the thread with a rounded tip.
- The present invention is explained in greater detail below with reference to the embodiments illustrated in the drawings, in which:
-
FIG. 1 shows a screw having an outer thread according to the invention; -
FIG. 2 shows a nut having an inner thread according to the invention; -
FIG. 3 shows a screw connection having an outer thread according to the invention in an inner thread of a workpiece; and -
FIG. 4 shows a screw connection of a nut having an inner thread according to the invention with a commercially available screw. -
FIG. 1 is a three-dimensional illustration of ascrew 10 having ahead 12 and a shaft 14 having anouter thread 16 according to the invention. According to the invention, the flanks of the thread which receive the forces when the screw is tightened, that is to say, in the present case theflanks 18 of theouter thread 16 directed upwards inFIG. 1 are provided withprotuberances 20 which extend over a limited curved portion of the respective thread turns into the thread turn. In the present case, theseprotuberances 20 are each spaced apart by approximately 120°, that is to say, there are threeprotuberances 20 on a winding revolution. The protuberances cover a total of approximately ⅓ of the entire winding revolution. They are constructed so as to acutely taper in a rotation direction with a rounded end and so as to arch in a circular-arc shape in cross-section. -
FIG. 2 shows anut 100 according to the invention with aninner thread 116. In this instance, theflanks 118 which are loaded with force when the nut is tightened also carryprotuberances 120 which in this case also each extend over only a short portion of an entire thread revolution. In this embodiment, only two mutually opposed protuberances are provided in a thread revolution, and in this instance cover less than ⅛ of the entire thread revolution. -
FIG. 3 shows the state in which ascrew 10 having anouter thread 16 according to the invention is screwed into aworkpiece 30 and tightened, there being located between the head (not illustrated) of thescrew 10 and theworkpiece 30 anotherworkpiece 40 which is secured by means of thescrew 10. In this detailed illustration, it can be seen particularly well how theprotuberances 20 are arranged on theflanks 18 of theouter thread 16 that receive the load. In this instance, the precise configuration of theprotuberances 20 can be seen particularly well. They have a circular-arc-shaped cross-section and taper at least in the screwing-in direction of thescrew 10 and terminate with arounded tip 22. - In the lower region of
FIG. 3 , which shows the state after thescrew 10 has been tightened in theworkpiece 30, it can be seen very well how a deformation of the force-absorbing flanks of thecounter thread 32 in theworkpiece 30 occurs owing to the tightening force. - As long as the screw is still being screwed in, that is, is not applying any pretensioning forces to the
second workpiece 40, the play between thethreads screw 10 to be able to rotate freely without theprotuberances 20 coming into engagement at the opposing flanks of thethread 32. However, when thescrew 10 has then been tightened, as illustrated inFIG. 3 , theupper flanks 18 of thethread 16 of thescrew 10 inFIG. 3 are pressed against the lower flanks of thecounter-thread 32 in theworkpiece 30 inFIG. 3 . A corresponding deformation is thereby caused in theworkpiece 30 which deformation, according to the invention, is only a resilient and not a plastic deformation of the regions of the downwardly directed flanks of thecounter thread 32 opposite theprotuberances 20 inFIG. 3 . The corresponding resilient deformation is indicated by the tension lines 34 in theworkpiece 30. Theclearance 36, which enables the easy screwing-in of thescrew thread 16 into theinner thread 32 of theworkpiece 30 has now been moved completely downwards by the tightening of thescrew 10. -
FIG. 4 shows the screw connection of anut 100 according to the invention with a commerciallyavailable screw 10′. The workpiece clamped between thehead 12 of thescrew 10′ and thenut 100 is not illustrated in order to simplify the drawings. However, the tightened state of the screw connection is shown. - In this drawing, both the
screw 10′ and thenut 100 are each illustrated in a cross-section. It can clearly be seen how theprotuberances 120 on the thread turns of thenut thread 116 bring about a resilient deformation of the flanks of thescrew thread 16′ which are in this instance force-loaded. The corresponding resilient deformation is indicated by thetension lines 134. - As explained above with reference to the drawings, therefore, the securing of the self-locking thread according to the invention is therefore carried out when the corresponding screw connection is tightened and the corresponding pretensioning force is consequently applied by means of partial resilient deformation of the flanks of the counter-thread. Owing to this resilient deformation, a spring effect is produced at the force-loaded thread flank of the counter-thread. Consequently, the screw connection according to the invention is secured against being released by means of distortion.
- The
protuberances 20 according to the invention settle resiliently in the counter-thread. When the connection is released, an additional release torque must necessarily be overcome, which is produced by means of the resilient settlement of theprotuberances 20 in the counter-thread. This “resilient toothing effect” ensures that, when the connection is released, there is no damage to the counter-thread. Consequently, the connection can be rescrewed at any time and also released and screwed again several times, without new components having to be used. - Advantageously, therefore, the self-securing thread described here secures a screw connection in such a manner that no chemical additives are required, and no permanent plastic deformation of the threads or damage to the head support occur. The connection can be released at any time and can be rescrewed at any time with a complete securing effect.
- The principle of securing according to the invention is therefore based on the resilient deformability of the flanks of the counter-thread. The self-locking thread according to the invention has, according to the invention, partially or depending on the application, specially constructed
protuberances 20 over the complete length of the thread. - Those protuberances may be applied, depending on the load to be anticipated, by the pretensioning forces when the screw connection is tightened, either on the upper side or on the lower side of the respective thread. If a thread is desired which secures in a self-locking manner, at a specific screwing-in depth regardless of the pretensioning force, protuberances may be applied on both thread flanks in the corresponding region of the thread. These then act counter to each other and require no pretensioning force during tightening in order to clamp. In this manner, loose screw connections, for example of components which are intended to remain movable, can also be secured against being rotated open. This solution according to the invention therefore makes the locking of two nuts superfluous.
- According to the invention, the
protuberances 20 are constructed in such a manner that they do not cause any permanent mechanical deformation in the counter-thread when the thread is screwed in. If the thread is intended to be secured only after the screw connection is tightened by the pretensioning force, the height of theprotuberances 20 is intended to be constructed in such a manner that screwing in as far as the head support is possible without additional torque. - The production of the threads which are provided according to the invention with
protuberances protuberances 20 must be provided only once in the milling or rolling tools. Consequently, these protuberances can also be produced when the threads are milled or rolled without any additional processing complexity.
Claims (6)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202010015839U | 2010-11-26 | ||
DE202010015839.7 | 2010-11-26 | ||
DE202010015839U DE202010015839U1 (en) | 2010-11-26 | 2010-11-26 | Self-locking thread |
PCT/DE2011/050049 WO2012079569A2 (en) | 2010-11-26 | 2011-11-24 | Self-locking screw |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130236266A1 true US20130236266A1 (en) | 2013-09-12 |
US8905694B2 US8905694B2 (en) | 2014-12-09 |
Family
ID=43662990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/885,968 Expired - Fee Related US8905694B2 (en) | 2010-11-26 | 2011-11-24 | Self-locking screw |
Country Status (11)
Country | Link |
---|---|
US (1) | US8905694B2 (en) |
EP (1) | EP2643599A2 (en) |
JP (1) | JP2013543962A (en) |
KR (1) | KR20130132820A (en) |
CN (1) | CN103328835A (en) |
AU (1) | AU2011344915A1 (en) |
BR (1) | BR112013011973A2 (en) |
CA (1) | CA2819083A1 (en) |
DE (1) | DE202010015839U1 (en) |
MX (1) | MX2013005917A (en) |
WO (1) | WO2012079569A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018060264A1 (en) | 2016-09-27 | 2018-04-05 | Hartmut Flaig | Internally threaded locking element, threaded connection and production method and tool |
EP3524833A4 (en) * | 2017-12-15 | 2019-10-09 | Beijing Institute of Technology | Anti-loose threaded pair and anti-loose threaded part |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011100246A1 (en) * | 2011-05-02 | 2012-11-08 | Pierburg Gmbh | Safety screw for screw joint in thermally or chemically loaded region, has deformations distributed over circumference of screw and formed at tooth flank of thread pitch in screw-in direction |
JP2018144701A (en) * | 2017-03-07 | 2018-09-20 | 株式会社ジェイテクト | Rack guide device |
WO2019142378A1 (en) * | 2018-01-19 | 2019-07-25 | 日本精工株式会社 | Nut, feed screw mechanism, and electric position adjustment device for steering wheel |
WO2022145078A1 (en) * | 2020-12-28 | 2022-07-07 | ハードロック工業株式会社 | Anti-loosening bolt |
CN115111254A (en) * | 2022-05-19 | 2022-09-27 | 嘉兴意动能源有限公司 | Special-shaped anti-loosening threaded structure |
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US2484645A (en) * | 1946-10-23 | 1949-10-11 | Illinois Tool Works | Screw fastener |
US3176746A (en) * | 1963-04-01 | 1965-04-06 | Walton Marvin | Self-holding screw member |
US3186464A (en) * | 1961-04-03 | 1965-06-01 | Illinois Tool Works | Thread forming screw and method and apparatus for making the same |
US3426642A (en) * | 1962-02-05 | 1969-02-11 | Res Eng & Mfg | Self-tapping screws with threadforming projections |
US3530760A (en) * | 1968-11-08 | 1970-09-29 | Keystone Consolidated Ind Inc | Thread-forming screw |
US3643722A (en) * | 1969-05-16 | 1972-02-22 | Parker Kalon Corp | Self-locking threaded fasteners |
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US6447227B1 (en) * | 1998-08-21 | 2002-09-10 | Textron Fastening Systems Limited | Threaded fastener |
US6863483B2 (en) * | 2002-08-20 | 2005-03-08 | Ejot Gmbh & Co. Kb | Screw provided with self-locking thread |
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CN2672355Y (en) * | 2004-01-08 | 2005-01-19 | 张永华 | Full screwthread locking nut |
DE102009010390A1 (en) | 2009-02-26 | 2010-12-02 | Page Profilverbindungstechnik Gmbh | Nut, screw connection, profile connection and method for producing a nut |
-
2010
- 2010-11-26 DE DE202010015839U patent/DE202010015839U1/en not_active Expired - Lifetime
-
2011
- 2011-11-24 KR KR1020137013216A patent/KR20130132820A/en not_active Application Discontinuation
- 2011-11-24 JP JP2013540236A patent/JP2013543962A/en active Pending
- 2011-11-24 US US13/885,968 patent/US8905694B2/en not_active Expired - Fee Related
- 2011-11-24 BR BR112013011973A patent/BR112013011973A2/en not_active IP Right Cessation
- 2011-11-24 CN CN2011800566979A patent/CN103328835A/en active Pending
- 2011-11-24 MX MX2013005917A patent/MX2013005917A/en active IP Right Grant
- 2011-11-24 AU AU2011344915A patent/AU2011344915A1/en not_active Abandoned
- 2011-11-24 EP EP11833604.9A patent/EP2643599A2/en not_active Withdrawn
- 2011-11-24 CA CA2819083A patent/CA2819083A1/en not_active Abandoned
- 2011-11-24 WO PCT/DE2011/050049 patent/WO2012079569A2/en active Application Filing
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US2355486A (en) * | 1943-02-15 | 1944-08-08 | Tinnerman Products Inc | Fastening device |
US2484645A (en) * | 1946-10-23 | 1949-10-11 | Illinois Tool Works | Screw fastener |
US3186464A (en) * | 1961-04-03 | 1965-06-01 | Illinois Tool Works | Thread forming screw and method and apparatus for making the same |
US3426642A (en) * | 1962-02-05 | 1969-02-11 | Res Eng & Mfg | Self-tapping screws with threadforming projections |
US3176746A (en) * | 1963-04-01 | 1965-04-06 | Walton Marvin | Self-holding screw member |
US3530760A (en) * | 1968-11-08 | 1970-09-29 | Keystone Consolidated Ind Inc | Thread-forming screw |
US3643722A (en) * | 1969-05-16 | 1972-02-22 | Parker Kalon Corp | Self-locking threaded fasteners |
US5141376A (en) * | 1992-02-03 | 1992-08-25 | Emhart Inc. | Self drilling screw |
US5385439A (en) * | 1993-11-29 | 1995-01-31 | Hurdle; Donald R. | Radial extrusion thread-forming screw |
US6447227B1 (en) * | 1998-08-21 | 2002-09-10 | Textron Fastening Systems Limited | Threaded fastener |
US6863483B2 (en) * | 2002-08-20 | 2005-03-08 | Ejot Gmbh & Co. Kb | Screw provided with self-locking thread |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018060264A1 (en) | 2016-09-27 | 2018-04-05 | Hartmut Flaig | Internally threaded locking element, threaded connection and production method and tool |
EP3524833A4 (en) * | 2017-12-15 | 2019-10-09 | Beijing Institute of Technology | Anti-loose threaded pair and anti-loose threaded part |
US11268564B2 (en) | 2017-12-15 | 2022-03-08 | Beijing Institute Of Technology | Anti-loosening screw pair and anti-loosening screw component |
US11795990B2 (en) | 2017-12-15 | 2023-10-24 | Beijing Institute Of Technology | Anti-loosening screw pair and anti-loosening screw component |
Also Published As
Publication number | Publication date |
---|---|
WO2012079569A2 (en) | 2012-06-21 |
CA2819083A1 (en) | 2012-06-21 |
US8905694B2 (en) | 2014-12-09 |
KR20130132820A (en) | 2013-12-05 |
JP2013543962A (en) | 2013-12-09 |
MX2013005917A (en) | 2013-08-01 |
DE202010015839U1 (en) | 2011-02-24 |
EP2643599A2 (en) | 2013-10-02 |
WO2012079569A3 (en) | 2012-08-02 |
CN103328835A (en) | 2013-09-25 |
BR112013011973A2 (en) | 2016-08-30 |
AU2011344915A1 (en) | 2013-05-02 |
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